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--- 2024lctgmeetingchats [2024.03.28 04:07] – Steve Isenberg
+++ 2024lctgmeetingchats [2024.04.03 09:19] – Steve Isenberg
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 These are a record of the chats that were passed during meetings in 2024.  They have been edited to a small extent.\\
 To find chats for a given day, for example January 10, 2024, search for datecode 20240110 (2024, month 01, day 10).
+====20240403====
+===About Eclipses===
+<WRAP prewrap>
+<code>
+:53:53 From Barry Kort to Everyone:
+	PBS NOVA will probably produce an episode on the topic.
+:02:55 From Bob Primak to Everyone:
+	That airs tonight on PBS-2.
+:05:37 From Bob Primak to Everyone:
+	Great American Eclipse
+	Explore the spectacular cosmic phenomenon of a total solar eclipse.
+	PREMIERES: 4/3/24 8pm
+:12:04 From John Rudy to Everyone:
+	See Mark Twain's A Connecticut Yankee in King Arthur's Court.  Chapter 6 is the eclipse
+:19:28 From Barry Kort to Everyone:
+	In the Lewis & Clark Expedition, they relied on a predicted eclipse that would occur when they were in the Montana Territory to calibrate their clock and fix their exact position on that day, thus improving the reliability of their map making along the journey.
+:33:42 From Bob Primak to Everyone:
+	On Mars, eclipses (transits) don't block out the Sun, due to the small sizes of the Martian moons.
+:33:54 From Mitch Wolfe to Everyone:
+	Moon "distance from Earth varies between 225,700 miles (363,300 kilometers) and 252,000 miles (405,500 kilometers)." [About 10% diff.]
+:36:52 From Judy & Mike Alexander to Everyone:
+	the increase in the size of the moon's orbit is due to conservation of angular momentum: because of friction due to earth- and moon-tides, the spin of the earth slows down; the orbit of the moon "compensates" to conserve the total angular momentum of earth-plus-moon.
+:53:04 From Bob Primak to Everyone:
+	The Northeast, from western Pennsylvania into Maine, have the best shot at seeing clear skies and limited cloud cover. Eclipse forecast for Monday, April 8, 2024.
+:54:59 From John Rudy to Everyone:
+	apparently there have been many ads for bogus glasses
+:56:09 From Bob Primak to Everyone:
+	Buying glasses in-person (or getting them for free)
+	If you'd prefer to buy a pair of approved eclipse glasses in person, the AAS recommends stopping by a Home Depot, Lowe's or Walmart to check if they have any in stock. (Some, but not all, locations sell ISO-approved eclipse glasses, according to the AAS.) Additionally, many libraries around the U.S. will be giving away free pairs of approved eclipse glasses; call your local branch
+:00:53 From tedpk to Everyone:
+	certain degree of unpreparedness for example the diamond ring and the less well known Bailey's beads and the Ruby necklace -- all of which relate to lunar non-spheroidicity
+:02:33 From tedpk to Everyone:
+	another problem with the discussion -- there is a confusion between scattering and refraction in the atmosphere
+:04:03 From John Rudy to Everyone:
+	best viewing is from the NASA videos
+:10:11 From John Rudy to Everyone:
+	blue moons roughly every 2.7 years on average.
+:11:08 From Steve Isenberg to Everyone:
+	But how could you see the eclipse in a plane with windows facing out the side of the plane?
+:11:24 From Bob Primak to Everyone:
+	An airliner can't outpace the shadow of the moon during an eclipse. So the advertised "eclipse flights" will not have much of an extended view of totality. Just, the planes will be above the clouds, so nearly certainly passengers will see the eclipse.
+:13:49 From John Rudy to Everyone:
+	I was on a plane flying near mt Everest.  Everyone moved to the right side of the plane to see the mountain.   So maybe 10,000 pounds moved sides.  Didn't notice any impact
+:14:58 From Steve Isenberg to Everyone:
+	The pilot would apply some changes to the airplane’s controls automatically to maintain level flight.
+:15:25 From Bob Primak to Everyone:
+	Problem is that the angle from which the sun is shining (Azimuth) is at a somewhat inconvenient angle compared to flight path. From the plane’s view the sun (and thus eclipse) would be about 7 or 8 o clock when looking at a clockface. Therefore the best would be that when totality shadow starts (or right before), the plane flies in a more northern direction or even a bit northeastern so most people on board would be able to see it clearly since we would then be at a right angle towards the eclipse (9 of clock). But this requires either that the pilot is a bit flexible (like the SW pilot in 2023 who did some zig zags as spur of the moment) or needs proper flight path planning which is what Alaska airlines did.
+:16:20 From Bob Primak to Everyone:
+	In this flight path, the pilot does some zig-zags to let passengers on either side of the plane to have a view.
+:16:34 From tedpk to Everyone:
+	Airliner should get you above most of the clouds -- so it could be useful -- the SR-71 once flew along the path of totality fast enough to "make time stand still" by doubling the length of totality
+:17:36 From Steve Isenberg to Everyone:
+	But the stars would come out during totality, like they do at night
+:19:56 From John Rudy to Everyone:
+	Anecdotally, I just heard there was a spike in births 9 months after the Chicago Cubs won the World Series.  Might the same be true with eclipses.   Or is this bogus?  Probably
+:21:01 From Bob Primak to Everyone:
+	A nova, not comet, will be present possibly during this eclipse.
+:21:38 From Bob Primak to Everyone:
+	About the Cubs and births, yes this was a local legend. Don't know about "eclipse babies".
+:22:50 From Mitch Wolfe to Everyone:
+	Some of the speaker's slides are from https://www.greatamericaneclipse.com/ that has a lot of related materials.
+</code>
+</WRAP>
+[[lexingtoncomputergroup|return]]
 ====20240327====